Behavior Driven Development for PHP (Research)

Worth mentioning http://codeception.com/

You're right, added. It's worth mentioning though, I think Behat encourages a better process by forcing you to create stories, before verifying the behavior of those stories. I know a lot of people say the advantage to Behat is other (non-programmers) being able to read the features, but I think it actually provides and even bigger benefit to programmers. We spend every day all day writing dollar signs and brackets, and I think there's something to said about getting out of the "programmer" mindset and really thinking about behavior on a higher level. One man's opinion of course :)